Rust

fix comment #542

Job	Run time
cargo check	1m 56s
build with wasm-pack	1m 54s
Check cargo fmt	38s
cargo test (mac)	10m 10s
Verify MSRV	6m 15s
Verify Vendored Code	51s
cargo test (win64)	6m 17s
cargo test doc (amd64)	0s
cargo examples (amd64)	0s
cargo test datafusion-cli (amd64)	0s
check Cargo.toml formatting	0s
clippy	0s
cargo test hash collisions (amd64)	0s
check configs.md is up-to-date	0s
cargo doc	0s
cargo test (amd64)	0s
Run sqllogictest with Postgres runner	0s
cargo test pyarrow (amd64)	0s
verify benchmark results (amd64)	0s
	28m 1s

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